4013501981 has 2 divisors, whose sum is σ = 4013501982. Its totient is φ = 4013501980.

The previous prime is 4013501969. The next prime is 4013502011. The reversal of 4013501981 is 1891053104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3318336025 + 695165956 = 57605^2 + 26366^2 .

It is a cyclic number.

It is not a de Polignac number, because 4013501981 - 2¹⁰ = 4013500957 is a prime.

It is a super-2 number, since 2×4013501981² = 32216396302981848722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4013501911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2006750990 + 2006750991.

It is an arithmetic number, because the mean of its divisors is an integer number (2006750991).

Almost surely, 2^4013501981 is an apocalyptic number.

It is an amenable number.

4013501981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4013501981 is an equidigital number, since it uses as much as digits as its factorization.

4013501981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 4013501981 is about 63352.2058100584. The cubic root of 4013501981 is about 1589.1851343212.

The spelling of 4013501981 in words is "four billion, thirteen million, five hundred one thousand, nine hundred eighty-one".